Unhappy Mobile Data /persist

Hey folks!
Me again and still haven't solved my problem:
I had some problems when downgrading the bootloader, now back at KitKat and everything works great except for the Dataconnection.
I can pull my SIMcard in and it also asks for the PIN but I can't connect to my carrier.
Can somebody help me solving this?
Is the .bin file in the /persist folder like the qualcomm wifi driver?

Thanks in advance
RS